Stuffing box without packing



Apri 11, 19 39: N. DlFAZlO 2,153,825

STUFFING BOX WITHOUT PACKING iled Sept. 17, 1957 zq- 8 2226' 2823 2/ /5 2 ,k 1 v gifyff A E Wmmmxxmmmmmxmmu/ INVENTOR NICHOLAS DIFAZIO W7 W ku ATTO R N EYS Patented Apr. 11, 1939 c i UNITED STATES PATENT OFFIQE 'STUFFING BOX WITHOUT PACKING Nicholas Difazio, Newark, N. J.

Application September 1'7, 1937, Serial No. 164,288

3 Claims. (01. 28510*) My invention is particularly applicable for use enters through the pipe 5, circulates within the with hollow rollers, the interior of which are coninterior of the roller 2, cooling the same. The structed to receive a cooling or heating medium. water flows from the interior of the roller 2 For purposes of description, I will resort to the around the outer surface of the pipe 5, flows to 5 type of roller in which a cooling medium is used. an outlet passage [9, in the end of the cylindrical 5 In this type of roller, water is continually circuhousing 3. The passage ii! has a pipe thread lated through the interior of the rollers. This connection 8 to receive one end of the outlet Water is under pressure, and it has been customary pipe 9. In normal operation there is a continual to prevent leakage of the water at the end of flow of cooling liquid into the pipe I, and after 10 the roller shaft, by means of a stufiing box. It it has performed its cooling function, it flows 10' is common practise to provide a packing in the out of the pipe 9. This water is under pressure, stufiing box, which when necessary, can be tightand it has become a problem to prevent leakage ened so as to prevent leakage. However, the life of the same from the end of the roller shaft. of the packing is short and in many instances I have succeeded in making a water tight seal,

the packing cuts the shaft of the roller, thus reby the use of my cylindrical housing 3, in coopll f quiring a complete replacement. Also in view eration with the flange [4. As illustrated, the of the limited life of the packing, it is necessary flange M is fixedly attached to the portion IE to pack the shaft at frequent intervals of time. of the standard Lby means of aseries of threaded This in itself entails a considerable expense, as bolts such as I5 and IT. The flange M has an 0 it requires both time and a shut down of the extension I5 which is bored to receive the shaft 4. machine. The flange extension l5 has an external thread It is an object of my invention to provide a which cooperates with the internal thread 13 complete seal for the roller shaft against the of the housing 3. leakage of water without the use of packing. The interior of the housing 3 is bored to dif- This I accomplish by my construction. In the ferentdiameters, as indicated by the numerals ll 25;.- event that there is a leakage, I have made provi-, and l 2. The narrow bore ll receives a hard fibre sion for tightening my device to take up .such washer 22. Adjacent the washer 22, an end wear as will cause the slight amount of leakage. thrust ball-bearing s positioned. T s b ll- By the use of my device there is very little occabearing comprises the races 24 and 25, and an sion for replacement of parts, and after an'inintermediate ring of balls 26. Adjacent the outer 30.}; stallation is once made, it is an inexpensive matrace 25 there is DOSitiOned a co d ard fibre ter to maintain the same. washer 23 of larger diameter than the first men- Other objects of my invention will become aptioned Washer 22. As will be noticed from the parent as the description proceeds. For purdrawing, the washer 23 is positioned in the larger poses of illustration, I have shown a preferred bore l2 of the housing 3. 35": embodiment of my invention, in which: Located directly above the ball-bearing ring Fig. 1 is a sectional elevational View through 26, is a conventional grease chamber 21, which the end of a hollow roller, showing my sealing through h passage 8. r v Wh necessary means o i t d th r with, lubrication is required for the ball-bearing ring 40 Fig. 2 is an elevational view of my invention 25. 40 shown in application with the end of a hollow The-fibre washer 23 has .a very close fit with roller. the interior wall of the bore 12. The closeness In the drawing, the hollow roller 2 is rotatably of this fit is such as not to pe it t pas supported by the bearing IS in the stationary of the cooling medium between the wall of the pedestal I. The hollow roller 2 has an extension bore l2 and the circumferential surface 2| of the 45 shaft 4, of less diameter than the diameter of washer 23. In an assembled position, the end roller 2. Provision must be made for cooling of the roller shaft 4 is indirect abutting engagethe interior of the roller 2. This is accomplished ment with one side of the fibre washer 23, as by circulating a cooling medium, such as water illustrated in Fig. 1. Under ordinary circumunder pressure, within the interior of the roller. stances, water circulating around the pipe 5 will 5 The cooling water enters through an inlet pipe pass through passages of the fibre washers 22, 1 attached by a screw thread connection 6 to the 23, and the end thrust ball-bearin 24 t0 S cylindrical housing 3. In line with the pipe 1 as to reach the passage Ill. If there is a comis a second pipe 5, similarly attached and axially plete seal between the surface of the bore 12 and located relative to the housing 3. Cold water the circumferential surface 2| of the hard fibre 55 washer 23, and between the end of the roller shaft 4 with the cooperating side wall of the washer 23, there can be no leakage of the cooling medium out of the housing 3, between the shaft 4 and the housing 3. In normal operation, the roller 2 rotates and as a consequence, the shaft 4 rotates with the hard fibre washer 23 within the bore l2 of the housing 3. The housing 3 is held stationary by its association with the fixed flange I 4.

After a period of time, there may be a slight wear at the circumferential surface 2| of the hard fibre washer 23, due to its rotation within the bore l2 of the housing 3. This might cause a slight leakage of the cooling medium between these coacting surfaces. In order to eliminate such leakage, it becomes merely necessary to rotate the housing 3 on its threaded flange connection l5. This will cause a take-up of the housing 3 on its threaded support l5, and as a consequence the end of the shaft 4 will be tightly jammed up against the side wall of the hard fibre washer 23. This side pressure of the end of the shaft 4 against the side wall of the pipe washer 23 will cause a suflicient expansion of the diameter of the washer 23, to again get a tight working fit between the washer 23 and the interior of the bore l2. This tightening operation can take place whenever it becomes necessary, in the event that there is a leakage of the cooling medium out of the housing 3 between the cooperating threads of the housing 3 and the flange extension I 5. Should the washer 23 become so badly worn that a replacement is necessary, this can be readily accomplished by removing the housing 3 from the threaded flange support [5. It is a simple matter to remove the worn washer 23 and replace the same by a new washer.

I have shown my invention as applied to a single hollow shaft. It is quite apparent, however, that where a series of shafts would be used, my invention could readily be applied individually to the end of each shaft.

By my construction I have eliminated the use of packing, which has heretofore proved detrimental and expensive. My construction is simple, practical and effective in its intended use. It is apparent that anyone skilled in the art might make slight changes, without deviating from the spirit of my invention, as covered by the scope of the following claims:

I claim:

1. The combination with a hollow roller having a hollow rotatable shaft end, inlet means for circulating a cooling medium through the end of said shaft into said roller, and outlet means to receive the flow of the cooling medium from the hollow roller; of means forming a sealed passage between said hollow rotatable shaft and said outlet means, said means comprising a stationary housing bored to receive said shaft end and said inlet means and connected with said outlet means, a stationary washer fitting tightly in one end of the bore of said housing, a rotatable washer engaging the end of said hollow shaft and fitting snugly with the interior walls of the bore of said housing, a thrust-bearing having a stationary race engaging said first-mentioned washer and fitting tightly with the interior wall of the bore of said housing and a rotatable race engaging said second-mentioned washer.

2. The combination with a hollow roller having a hollow rotatable shaft end, inlet means for circulating a cooling medium through the end of said shaft into said roller, and outlet means to receive the flow of the cooling medium from the hollow roller; of means forming a sealed passage between said hollow rotatable shaft and said outlet means, said means comprising a stationary housing bored to receive said shaft end and said inlet means and connected with said outlet means, the external end of said housing having a bore of smaller diameter than said rotatable shaft end communicating with said outlet means, a stationary washer fitting tightly in said smaller bore, a rotatable washer engaging said hollow shaft end and fitting snugly with the interior walls of said larger bore, a thrust-bearing having a stationary race fitting tightly with said smaller bore and engaging said stationary washer, and a rotatable race spaced from the interior walls of said larger bore and engaging said rotatable washer.

3. The combination with a hollow roller having a hollow rotatable shaft end, stationary n means for rotatably supporting said shaft, inlet means for circulating a cooling medium through the end of said shaft into said roller, and outlet means to receive the flow of the cooling medium from the hollow roller; of means forming a sealed passage between said hollow rotatable shaft and said outlet means, said means comprising a flanged male member attached to said stationary support, said male member being bored to house the shaft and having its outer surface screwthreaded, a female housing having an internal thread at one end thereof for engagement with the thread of said male member, said female housing having a bore to receive said hollow shaft end and a bore of smaller diameter in the external end thereof, a stationary washer in said smaller bore, a rotatable washer engaging said hollow shaft end and fitting snugly with the interior walls of said larger bore, a thrust-bearing having a stationary race fitting tightly in said smaller bore and engaging said stationary washer and a rotatable race spaced from the interior walls of said larger bore and engaging said rotatable washer.

NICHOLAS DIFAZIO. 

